The National Transportation Safety Board (NTSB) is a group of people who work together to investigate accidents that happen in transportation. They look at accidents involving airplanes, trains, boats, and cars. They do this because they want to find out what caused the accident so they can prevent it from happening again in the future.
Think of the NTSB as like a group of detectives. Just like how detectives investigate crimes to figure out what happened, the NTSB investigates transportation accidents to figure out what happened. They talk to people who witnessed the accident, collect evidence, and examine data to try to piece together what happened.
The NTSB is very important because their investigations can lead to changes that make transportation safer. For example, if they find out that an airplane accident was caused by a certain design flaw, they might recommend that all airplanes should be built differently so that the flaw doesn't exist anymore. This can prevent future accidents from happening.
Overall, the NTSB is a group of smart people who work together to figure out what causes transportation accidents. By doing this, they make transportation safer for everyone!